A new rumor regarding Avengers: Doomsday reveals potential MCU characters that won't return for the upcoming crossover event.

After fighting Galactus, Silver Surfer, Mole Man, and more in First Steps, there are more MCU villains we want the Fantastic Four to face.

Doomsday? That's the million-dollar question, and a new rumour claims to shed some light on his Multiversal mission. Read on ...